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LIABILITIES FOR INSURANCE PRODUCTS - SUMMARY OF AMOUNT OF UNDISCOUNTED AND DISCOUNTED EXPECTED GROSS PREMIUMS AND EXPECTED FUTURE BENEFITS (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Jun. 30, 2025
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Other annuities |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | $ 0.0 | $ 0.0
Expected future gross premiums (Discounted) | 0.0 | 0.0
Expected future benefits and expenses (Undiscounted) | 296.6 | 319.9
Expected future benefits and expenses (Discounted) | 251.5 | 263.5
Supplemental health |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 9,233.4 | 9,069.6
Expected future gross premiums (Discounted) | 5,664.0 | 5,587.9
Expected future benefits and expenses (Undiscounted) | 11,000.3 | 11,061.4
Expected future benefits and expenses (Discounted) | 6,001.7 | 5,954.9
Medicare supplement |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 7,645.8 | 6,564.7
Expected future gross premiums (Discounted) | 5,098.6 | 4,487.0
Expected future benefits and expenses (Undiscounted) | 6,152.8 | 5,259.4
Expected future benefits and expenses (Discounted) | 4,095.0 | 3,577.4
Long-term care |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 3,762.0 | 3,359.6
Expected future gross premiums (Discounted) | 2,581.0 | 2,467.6
Expected future benefits and expenses (Undiscounted) | 8,248.7 | 8,002.2
Expected future benefits and expenses (Discounted) | 4,370.3 | 4,300.7
Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 5,767.0 | 5,746.9
Expected future gross premiums (Discounted) | 4,135.9 | 4,149.2
Expected future benefits and expenses (Undiscounted) | 7,648.1 | 7,645.7
Expected future benefits and expenses (Discounted) | $ 4,626.4 | $ 4,641.9

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